1 files changed, 6 insertions, 0 deletions
diff --git a/vm.h b/vm.h
index b1c543eb9c..855efeae06 100644
--- a/vm.h
+++ b/vm.h
@@ -220,6 +220,12 @@ default:                        \
   ((rb_control_frame_t *)(th->stack + th->stack_size) - (rb_control_frame_t *)(cfp))
 #define VM_SP_CNT(th, sp) ((sp) - (th)->stack)
 
+#define CHECK_STACK_OVERFLOW(cfp, margin) do \
+  if (((VALUE *)(cfp)->sp) + (margin) >= ((VALUE *)cfp)) { \
+      rb_exc_raise(sysstack_error); \
+  } \
+while (0)
+
 /*
   env{
     env[0] // special (block or prev env)